# Airworthiness Directives; Boeing Model 747 Series Airplanes
> **Rule** · Final rule. · Published 2000-07-19 · Effective 2000-08-23 · 65 FR 44670
## Document
- **Document number:** 00-18039
- **Category:** airworthiness
- **Manufacturer:** Boeing Model 747 Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 65 FR 44670
- **Publication date:** 2000-07-19
- **Effective date:** 2000-08-23
- **FAA docket:** Docket No. 99-NM-335-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 747 series airplanes, that requires replacement of any brake system accumulator that has aluminum end caps with an accumulator that has stainless steel end caps. This amendment is prompted by reports of fractures of aluminum end caps on brake system accumulators. The actions specified by this AD are intended to prevent high-velocity separation of a brake system accumulator barrel, piston, or end cap, which could result in injury to personnel in the wheel well area, loss of cabin pressurization, loss of certain hydraulic systems, or damage to the fuel line of the auxiliary power unit.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2000/07/19/00-18039/airworthiness-directives-boeing-model-747-series-airplanes)
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